CRANIOPHARYNGIOMA MANAGEMENT PRINCIPLES AND RECENT ADVANCES Introduction n

CRANIOPHARYNGIOMA: MANAGEMENT PRINCIPLES AND RECENT ADVANCES

Introduction n 3 -5% of primary brain tumors 50% of paediatric supra sellar tumors No gender difference Craniopharyngioma: Management principles and recent advances

n n 70% combined suprasellar/ intrasellar Completely intrasellar craniopharyngiomas are rare. Craniopharyngioma: Management principles and recent advances

Preoperative evaluation and management n Complete endocrinological evaluation to uncover hypopituitarism particularly Growth hormone Cortisol Thyroid hormone deficiencies. Craniopharyngioma: Management principles and recent advances

Imaging X ray: n Irregular speckled calcification seen just above the sella turcica. n The semicircular shell outlining the wall of cystic lesion. n Fine flaky calcium -fast growing tumours. n Dense calcification -slow growing tumours. n Mostly suprasellar. n Calcification may be in cyst wall and/or solid component. Craniopharyngioma: Management principles and recent advances

Imaging MRI: n Hypo on T 1, hyper on T 2 WI n Multilobular n Multicystic n Enhances strongly/ heterogenously n Often both cyst walls and solid components enhance n Completely solid (rare) Craniopharyngioma: Management principles and recent advances

Classification n n Grade I (intrasellar or infradiaphragmatic) Grade II (occupying the cistern with or without an intrasellar component) Grade III (lower half of the third ventricle) Grade IV (upper half of the third ventricle) Grade V (reaching the septum pellucidum or lateral ventricles) Samii M, Tatagiba M, Neurol Med Chir, 1997; 37: 141 Craniopharyngioma: Management principles and recent advances

THERAPUETIC GOALS n Cure of disease with functional preservation and restoration. Craniopharyngioma: Management principles and recent advances

Surgical Approaches n n Ideal approach – Varies. Influenced by the tumour location with respect to the sella, chiasm and third ventricle. Craniopharyngioma: Management principles and recent advances

Anterior Midline Approach Trans-sphenoidal n Grade I and II n Decreased risk of visual injury n Difficult in young children (non-pneumatised sphenoid sinus) n CSF leak Craniopharyngioma: Management principles and recent advances

Anterior Midline Approach Subfrontal n Grade III and IV n Pre-chiasmatic dissection of the tumour n Potential violation of the frontal sinus n Damage to the olfactory tract n Technically more complicated (pre-fixed chiasm) Craniopharyngioma: Management principles and recent advances

Anterolateral Approach Pterional n Facilitating the resection of intrasellar, suprasellar, pre-chiasmatic and retrochiasmatic tumours. n Restricted view of the contra lateral opticocarotid triangle, the contralateral retrocarotid space and the ipsilateral hypothalamic wall. Craniopharyngioma: Management principles and recent advances

Anterolateral Approach Orbitozygomatic n Expands on the pterional approach n Significant suprasellar extension Craniopharyngioma: Management principles and recent advances

Transpetrosal Approach n Large retrochiasmatic tumors Craniopharyngioma: Management principles and recent advances

Intraventricular Approaches Transcallosal –transventricular n Foramen of Monro is dilated by a tumour projecting into the lateral ventricle n Frontal lobe retraction injury Craniopharyngioma: Management principles and recent advances

Intraventricular Approaches Transcortical –transventricular n Seizures n Large ventricles and tumour extending to the dorsal surface of the frontal lobe Craniopharyngioma: Management principles and recent advances

Intraventricular Approaches Trans lamina Terminalis n Intraventricular tumors n Pterional or a subfrontal approach to access the lamina terminalis Craniopharyngioma: Management principles and recent advances

Combined Approaches n Subtemporal –transpetrosal – q Primarily retrochiasmatic unilateral tumors extending to the posterior fossa along the clivus. n Pterional –transcallosal – q Aid removal of adherent and calcified tumor within the third ventricle. n In transcallosal + pterional approach, intraventricular portions of the tumour should be removed first, with the pterional approach only being performed if basal portions of the tumor remain inaccessible. Craniopharyngioma: Management principles and recent advances

Radical surgery n Possible in: q n Small or prechiasmatic Difficult in: q q Proximity and adherence of the lesion to the optic pathways and adjacent neurovascular structures Reterochiasmatic Large Multicompartmental Craniopharyngioma: Management principles and recent advances

Radical surgery Advantage n One treatment then only follow-up Disadvantages n Limited number of surgeons with adequate expertise n Difficult to assess true risks to individual child n Impaired quality of life n Diabetes insipidus (95%) Craniopharyngioma: Management principles and recent advances

Limited surgery Goals n Diagnosis n Drain cysts n Limit field of radiation n Control hydrocephalus n Improve vision n Decompress chiasm Craniopharyngioma: Management principles and recent advances

Limited surgery + radiation Advantages n Surgery can be performed with limited experience Disadvantages n Decrease in IQ n Cyst management (often multiple cyst procedures) n Complications of radiation n Diabetes insipidus (5%) Craniopharyngioma: Management principles and recent advances

Endoscopy n Grade 1 and 2 tumors q q n Advantages : q q n No brain retraction and the cosmetic deficit Less invasive Not appropriate q q n Transnasal Trans -sphenoidal Transethmoidal Transmaxillary When the lateral extent of the tumor passes more than 1 cm beyond the lateral limits of the exposure Epicentre of the tumour does not lie within the midline GTR rate 100% Schwartz TH, Fraser JF, Brown S, et al. , Neurosurgery, 2008; 62: 991 Craniopharyngioma: Management principles and recent advances

Radiation Therapy n GTR not possible q q Conventional RT Intracavitary radiation Fractionated radiotherapy Stereotactic radiosurgery Craniopharyngioma: Management principles and recent advances

Stereotactic radiosurgery n n n Better control rates with single type tumors Mean morbidity rate 4% Mortality rate 0. 05% Favourable quality of life outcome with tumours that decreased in size following GKS, while poor outcomes associated with tumour progression Limitation : Radio-sensitivity of the adjacent visual pathways( <8 Gy) Gopalan R, Dassoulas K, Rainey J, et al. , Neurosurg Focus, 2008; 24: E 5 Craniopharyngioma: Management principles and recent advances

Stereotactic radiosurgery n Advantages over conventional fractionated radiation therapy q Greater precision q Reducing the volume of irradiated brain tissue q Delivery of higher radiation doses with less damage to adjacent neurological structures n Concerns : q Vasculitis q Neuropsychological changes q Increased visual deficits Craniopharyngioma: Management principles and recent advances

Intracavitary radiation n Beta -emitting isotopes (Yttrium -90 , Phosphorus -32) n Control rates q q q 96% for cystic tumours 88% for partially cystic tumours Not effective for solid tumours (progression) Gopalan R, Dassoulas K, Rainey J, et al. , Neurosurg Focus, 2008; 24: E 5 n Complications q q q n Panhypopituitarism Diabetes insipidus CNS and visual dysfunction Combination of GKS and intracavitary irradiation with yttrium-90 or phosphorus-32 isotopes as primary therapy for mixed cystic–solid tumours. Hasegawa T, Kondziolka D, Hadjipanayis CG, et al. , Neurosurgery, 2004; 54: 813 Craniopharyngioma: Management principles and recent advances

Outcomes n Five -year progression-free survival rate q fractionated stereotactic radiosurgery q complete excision q partial resection 92% 80– 90% 50– 60% Minniti G, Saran F, Traish D, et al. , Radiother Oncol, 2007; 82: 90 n 10 -year recurrence-free survival rate q GTR q partial removal q surgery and radiotherapy 74– 81% 41– 42% 83– 90% Duff JM, Meyer FB, Ilstrup DM, et al. , Neurosurgery, 2000; 46: 291 n Overall survival = 80 to 91% at five- year follow-up (regardless of treatment modality) n Best predictor of survival : an absence of recurrence Craniopharyngioma: Management principles and recent advances

Recurrence n Within 1 - 4. 3 years n Peri -operative mortality significantly increased n Radiotherapy +/- surgery = significantly prevents further tumour progression n 15 -year progression-free survival =72% Hakuba A, Nishimura S, Inoue Y, Surg Neurol, 1985; 24: 405 n 10 -year local control rate = 83% Stripp DC, Maity A, Janss AJ, et al. , Int J Radiat Oncol Biol. Phys, 2004; 58: 714 Craniopharyngioma: Management principles and recent advances

Morbidity and Management of Complications n Increased intra- and post-operative morbidity rates q q q Diabetes insipidus Hypoadrenalism Hypothyroidism Hypopituitarism - requires lifelong treatment n n n n Visual fields/visual acuity improved or stabilized = 74% Long-term major visual field defects 48% at 10 -year follow-up Short -term memory loss Personality changes Cranial nerve deficits Epilepsy Anosmia Position -dependent vertigo Craniopharyngioma: Management principles and recent advances

n Hypothalamic dysfunction q q q n Appetite changes Apathy Sleep disorders Memory deficits Hyperphagia and obesity =26– 52% = Long -term mortality rates in adult patients five-fold higher (cardiovascular mortality). Craniopharyngioma: Management principles and recent advances

Conclusions n Conclusive treatment remains a matter of debate. n When GTR is not an option, STR combined with radiotherapy becomes therapeutic option of choice. n Most importantly, the treatment of craniopharyngiomas is complicated both surgically and medically, necessitating a multidisciplinary approach involving neurosurgery, neurology, endocrinology, ophthalmology and neuropsychology. Craniopharyngioma: Management principles and recent advances

Cystic tumor q q Intracavitary bleomycin / 90 Y Interferon alpha 2 a (when all conventional therapy fails) Craniopharyngioma: Management principles and recent advances

Thank you Craniopharyngioma: Management principles and recent advances